| Official Name: | Roiu |
| Pushpin Map: | Estonia |
| Mapsize: | 200px |
| Subdivision Type: | Country |
| Subdivision Name: | Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Tartu County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Kastre Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
Roiu is a small borough (Estonian: alevik) in Kastre Parish, Tartu County, in eastern Estonia.[1]